Limiting Recursive Reflections
When a reflective object is reflected in another object, the first object can be seen in the
reflection, potentially causing an endless repetition of reflections. Motion limits the number
of reflective bounces that can occur in a scene, preserving performance and preventing
the viewer from getting lost in infinity. The number of allowed reflections is set per project.
To set the number of recursive reflections in the current project
Choose Edit > Project Properties (or press Command-J).
The Properties Inspector for the project opens.
In the Reflections section, adjust the Maximum Bounces slider.
Motion tracking is a method of recording the movement of an element (a shape or
reference point in a movie clip) in the Canvas, then applying that recorded movement
data to another element in the Canvas. For example, you can use motion tracking
techniques to pin a post-production graphic to the side of a moving bus, track a blurry
circle to a person’s face to preserve an innocent bystander’s anonymity, or replace a
daring stuntman’s head with the lazy mug of a leading actor.
This chapter covers the following:
About Motion Tracking
How a Tracker Works
Motion Tracking Behaviors
Shape Track Points Behavior
General Motion Tracking Workflow
Match Move Workflows
Using a Non-Match Move Four-Point Track for Corner-Pinning
Track Points Workflow
Track Parameter Workflow
Adjusting the Onscreen Trackers
Strategies for Better Tracking
Tracking Behavior Parameters